Exemples Flutter

// Flutter Hello World Examples

import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

// 1. Basic Hello World App
class HelloWorldApp extends StatelessWidget {
  const HelloWorldApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        useMaterial3: true,
      ),
      home: const HelloWorldScreen(),
    );
  }
}

class HelloWorldScreen extends StatelessWidget {
  const HelloWorldScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Hello World'),
        backgroundColor: Colors.blue,
        foregroundColor: Colors.white,
      ),
      body: const Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Text(
              'Hello, World!',
              style: TextStyle(
                fontSize: 24,
                fontWeight: FontWeight.bold,
                color: Colors.blue,
              ),
            ),
            SizedBox(height: 16),
            Text(
              'Welcome to Flutter!',
              style: TextStyle(
                fontSize: 16,
                color: Colors.grey,
              ),
            ),
          ],
        ),
      ),
    );
  }
}

// 2. Interactive Counter App
class CounterApp extends StatefulWidget {
  const CounterApp({super.key});

  @override
  State<CounterApp> createState() => _CounterAppState();
}

class _CounterAppState extends State<CounterApp> {
  int _counter = 0;

  void _incrementCounter() {
    setState(() {
      _counter++;
    });
  }

  void _decrementCounter() {
    setState(() {
      _counter--;
    });
  }

  void _resetCounter() {
    setState(() {
      _counter = 0;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Counter App',
      theme: ThemeData(
        primarySwatch: Colors.green,
        useMaterial3: true,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Counter App'),
          backgroundColor: Colors.green,
          foregroundColor: Colors.white,
        ),
        body: Center(
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              const Text(
                'You have pushed the button this many times:',
                style: TextStyle(fontSize: 16),
              ),
              Text(
                '$_counter',
                style: const TextStyle(
                  fontSize: 48,
                  fontWeight: FontWeight.bold,
                  color: Colors.green,
                ),
              ),
              const SizedBox(height: 32),
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceEvenly,
                children: [
                  FloatingActionButton(
                    onPressed: _decrementCounter,
                    tooltip: 'Decrement',
                    backgroundColor: Colors.red,
                    child: const Icon(Icons.remove),
                  ),
                  FloatingActionButton(
                    onPressed: _resetCounter,
                    tooltip: 'Reset',
                    backgroundColor: Colors.orange,
                    child: const Icon(Icons.refresh),
                  ),
                  FloatingActionButton(
                    onPressed: _incrementCounter,
                    tooltip: 'Increment',
                    backgroundColor: Colors.green,
                    child: const Icon(Icons.add),
                  ),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }
}

// 3. User Profile Form
class UserProfileForm extends StatefulWidget {
  const UserProfileForm({super.key});

  @override
  State<UserProfileForm> createState() => _UserProfileFormState();
}

class _UserProfileFormState extends State<UserProfileForm> {
  final _formKey = GlobalKey<FormState>();
  final _nameController = TextEditingController();
  final _emailController = TextEditingController();
  final _ageController = TextEditingController();
  final _bioController = TextEditingController();

  bool _isEditing = false;
  Map<String, String> _userProfile = {};

  @override
  void dispose() {
    _nameController.dispose();
    _emailController.dispose();
    _ageController.dispose();
    _bioController.dispose();
    super.dispose();
  }

  void _toggleEditMode() {
    setState(() {
      _isEditing = !_isEditing;
      if (_isEditing) {
        _nameController.text = _userProfile['name'] ?? '';
        _emailController.text = _userProfile['email'] ?? '';
        _ageController.text = _userProfile['age'] ?? '';
        _bioController.text = _userProfile['bio'] ?? '';
      }
    });
  }

  void _saveProfile() {
    if (_formKey.currentState!.validate()) {
      setState(() {
        _userProfile = {
          'name': _nameController.text,
          'email': _emailController.text,
          'age': _ageController.text,
          'bio': _bioController.text,
        };
        _isEditing = false;
      });

      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(
          content: Text('Profile saved successfully!'),
          backgroundColor: Colors.green,
        ),
      );
    }
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'User Profile',
      theme: ThemeData(
        primarySwatch: Colors.purple,
        useMaterial3: true,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: Text(_isEditing ? 'Edit Profile' : 'User Profile'),
          backgroundColor: Colors.purple,
          foregroundColor: Colors.white,
          actions: [
            IconButton(
              icon: Icon(_isEditing ? Icons.save : Icons.edit),
              onPressed: _isEditing ? _saveProfile : _toggleEditMode,
            ),
          ],
        ),
        body: Padding(
          padding: const EdgeInsets.all(16.0),
          child: Form(
            key: _formKey,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                if (!_isEditing && _userProfile.isNotEmpty) ...[
                  _buildProfileDisplay(),
                ] else ...[
                  TextFormField(
                    controller: _nameController,
                    decoration: const InputDecoration(
                      labelText: 'Name',
                      prefixIcon: Icon(Icons.person),
                      border: OutlineInputBorder(),
                    ),
                    validator: (value) {
                      if (value == null || value.isEmpty) {
                        return 'Please enter your name';
                      }
                      return null;
                    },
                  ),
                  const SizedBox(height: 16),
                  TextFormField(
                    controller: _emailController,
                    decoration: const InputDecoration(
                      labelText: 'Email',
                      prefixIcon: Icon(Icons.email),
                      border: OutlineInputBorder(),
                    ),
                    keyboardType: TextInputType.emailAddress,
                    validator: (value) {
                      if (value == null || value.isEmpty) {
                        return 'Please enter your email';
                      }
                      if (!value.contains('@')) {
                        return 'Please enter a valid email';
                      }
                      return null;
                    },
                  ),
                  const SizedBox(height: 16),
                  TextFormField(
                    controller: _ageController,
                    decoration: const InputDecoration(
                      labelText: 'Age',
                      prefixIcon: Icon(Icons.cake),
                      border: OutlineInputBorder(),
                    ),
                    keyboardType: TextInputType.number,
                    validator: (value) {
                      if (value == null || value.isEmpty) {
                        return 'Please enter your age';
                      }
                      if (int.tryParse(value) == null) {
                        return 'Please enter a valid number';
                      }
                      return null;
                    },
                  ),
                  const SizedBox(height: 16),
                  TextFormField(
                    controller: _bioController,
                    decoration: const InputDecoration(
                      labelText: 'Bio',
                      prefixIcon: Icon(Icons.description),
                      border: OutlineInputBorder(),
                    ),
                    maxLines: 3,
                  ),
                  const SizedBox(height: 24),
                  if (_isEditing)
                    Row(
                      children: [
                        Expanded(
                          child: ElevatedButton(
                            onPressed: _saveProfile,
                            style: ElevatedButton.styleFrom(
                              backgroundColor: Colors.purple,
                              foregroundColor: Colors.white,
                              padding: const EdgeInsets.symmetric(vertical: 16),
                            ),
                            child: const Text('Save Profile'),
                          ),
                        ),
                        const SizedBox(width: 16),
                        Expanded(
                          child: OutlinedButton(
                            onPressed: _toggleEditMode,
                            style: OutlinedButton.styleFrom(
                              padding: const EdgeInsets.symmetric(vertical: 16),
                            ),
                            child: const Text('Cancel'),
                          ),
                        ),
                      ],
                    ),
                ],
              ],
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildProfileDisplay() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        _buildInfoCard('Name', _userProfile['name']!, Icons.person),
        _buildInfoCard('Email', _userProfile['email']!, Icons.email),
        _buildInfoCard('Age', _userProfile['age']!, Icons.cake),
        if (_userProfile['bio']!.isNotEmpty)
          _buildInfoCard('Bio', _userProfile['bio']!, Icons.description),
        const SizedBox(height: 24),
        ElevatedButton(
          onPressed: _toggleEditMode,
          style: ElevatedButton.styleFrom(
            backgroundColor: Colors.purple,
            foregroundColor: Colors.white,
            minimumSize: const Size(double.infinity, 48),
          ),
          child: const Text('Edit Profile'),
        ),
      ],
    );
  }

  Widget _buildInfoCard(String label, String value, IconData icon) {
    return Card(
      margin: const EdgeInsets.only(bottom: 16),
      child: ListTile(
        leading: Icon(icon, color: Colors.purple),
        title: Text(label),
        subtitle: Text(value),
      ),
    );
  }
}

// 4. Todo List App
class TodoApp extends StatefulWidget {
  const TodoApp({super.key});

  @override
  State<TodoApp> createState() => _TodoAppState();
}

class _TodoAppState extends State<TodoApp> {
  final List<Todo> _todos = [];
  final TextEditingController _textFieldController = TextEditingController();

  void _addTodoItem(String title) {
    if (title.isNotEmpty) {
      setState(() {
        _todos.add(Todo(
          title: title,
          createdAt: DateTime.now(),
        ));
      });
      _textFieldController.clear();
    }
  }

  void _toggleTodoStatus(int index) {
    setState(() {
      _todos[index].isDone = !_todos[index].isDone;
    });
  }

  void _deleteTodoItem(int index) {
    setState(() {
      _todos.removeAt(index);
    });
  }

  void _clearCompleted() {
    setState(() {
      _todos.removeWhere((todo) => todo.isDone);
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Todo App',
      theme: ThemeData(
        primarySwatch: Colors.teal,
        useMaterial3: true,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Todo List'),
          backgroundColor: Colors.teal,
          foregroundColor: Colors.white,
        ),
        body: Column(
          children: [
            Padding(
              padding: const EdgeInsets.all(16.0),
              child: Row(
                children: [
                  Expanded(
                    child: TextField(
                      controller: _textFieldController,
                      decoration: InputDecoration(
                        labelText: 'What needs to be done?',
                        hintText: 'Enter a todo item',
                        border: const OutlineInputBorder(),
                        suffixIcon: IconButton(
                          icon: const Icon(Icons.add),
                          onPressed: () => _addTodoItem(_textFieldController.text),
                        ),
                      ),
                      onSubmitted: _addTodoItem,
                    ),
                  ),
                ],
              ),
            ),
            _buildStatsBar(),
            Expanded(
              child: ListView.builder(
                itemCount: _todos.length,
                itemBuilder: (context, index) {
                  final todo = _todos[index];
                  return Dismissible(
                    key: Key(todo.title),
                    background: Container(
                      color: Colors.red,
                      alignment: Alignment.centerRight,
                      padding: const EdgeInsets.only(right: 20.0),
                      child: const Icon(Icons.delete, color: Colors.white),
                    ),
                    onDismissed: (direction) {
                      _deleteTodoItem(index);
                    },
                    child: ListTile(
                      leading: Checkbox(
                        value: todo.isDone,
                        onChanged: (value) => _toggleTodoStatus(index),
                        activeColor: Colors.teal,
                      ),
                      title: Text(
                        todo.title,
                        style: TextStyle(
                          decoration: todo.isDone ? TextDecoration.lineThrough : null,
                          color: todo.isDone ? Colors.grey : null,
                        ),
                      ),
                      subtitle: Text(
                        'Created: ${_formatDate(todo.createdAt)}',
                        style: const TextStyle(fontSize: 12),
                      ),
                      trailing: IconButton(
                        icon: const Icon(Icons.delete_outline),
                        onPressed: () => _deleteTodoItem(index),
                      ),
                    ),
                  );
                },
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _buildStatsBar() {
    final completedCount = _todos.where((todo) => todo.isDone).length;
    final totalCount = _todos.length;
    final activeCount = totalCount - completedCount;

    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 16.0, vertical: 8.0),
      color: Colors.teal.withOpacity(0.1),
      child: Row(
        mainAxisAlignment: MainAxisAlignment.spaceBetween,
        children: [
          Text('$activeCount active, $completedCount completed'),
          if (completedCount > 0)
            TextButton(
              onPressed: _clearCompleted,
              child: const Text('Clear completed'),
            ),
        ],
      ),
    );
  }

  String _formatDate(DateTime date) {
    return '${date.day}/${date.month}/${date.year}';
  }
}

class Todo {
  String title;
  DateTime createdAt;
  bool isDone;

  Todo({
    required this.title,
    required this.createdAt,
    this.isDone = false,
  });
}

// 5. Main Demo App
class FlutterDemoApp extends StatefulWidget {
  const FlutterDemoApp({super.key});

  @override
  State<FlutterDemoApp> createState() => _FlutterDemoAppState();
}

class _FlutterDemoAppState extends State<FlutterDemoApp> {
  int _selectedIndex = 0;

  final List<Widget> _pages = [
    const HomePage(),
    const CounterPage(),
    const ProfilePage(),
    const TodoPage(),
  ];

  void _onItemTapped(int index) {
    setState(() {
      _selectedIndex = index;
    });
  }

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter Demo',
      theme: ThemeData(
        primarySwatch: Colors.indigo,
        useMaterial3: true,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Flutter Demo App'),
          backgroundColor: Colors.indigo,
          foregroundColor: Colors.white,
        ),
        body: _pages[_selectedIndex],
        bottomNavigationBar: BottomNavigationBar(
          currentIndex: _selectedIndex,
          onTap: _onItemTapped,
          selectedItemColor: Colors.indigo,
          unselectedItemColor: Colors.grey,
          items: const [
            BottomNavigationBarItem(
              icon: Icon(Icons.home),
              label: 'Home',
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.countertops),
              label: 'Counter',
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.person),
              label: 'Profile',
            ),
            BottomNavigationBarItem(
              icon: Icon(Icons.checklist),
              label: 'Todos',
            ),
          ],
        ),
      ),
    );
  }
}

// Page widgets
class HomePage extends StatelessWidget {
  const HomePage({super.key});

  @override
  Widget build(BuildContext context) {
    return const Padding(
      padding: EdgeInsets.all(16.0),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            'Welcome to Flutter!',
            style: TextStyle(
              fontSize: 24,
              fontWeight: FontWeight.bold,
              color: Colors.indigo,
            ),
          ),
          SizedBox(height: 16),
          Text(
            'This is a comprehensive Flutter demo showcasing:',
            style: TextStyle(fontSize: 16),
          ),
          SizedBox(height: 8),
          _FeatureList(),
        ],
      ),
    );
  }
}

class _FeatureList extends StatelessWidget {
  const _FeatureList({super.key});

  @override
  Widget build(BuildContext context) {
    final features = [
      '📱 Cross-platform mobile development',
      '🎨 Beautiful Material Design UI',
      '⚡ Fast development with Hot Reload',
      '🔄 Reactive state management',
      '🧩 Reusable widgets',
      '🧪 Built-in testing support',
      '📦 Rich package ecosystem',
      '🎯 Native performance',
    ];

    return Column(
      children: features.map((feature) => Padding(
        padding: const EdgeInsets.symmetric(vertical: 4.0),
        child: Row(
          children: [
            Expanded(
              child: Text(
                feature,
                style: const TextStyle(fontSize: 14),
              ),
            ),
          ],
        ),
      )).toList(),
    );
  }
}

class CounterPage extends StatelessWidget {
  const CounterPage({super.key});

  @override
  Widget build(BuildContext context) {
    return const Center(
      child: Text(
        'Counter Page\nNavigate to see the counter app',
        textAlign: TextAlign.center,
        style: TextStyle(fontSize: 18),
      ),
    );
  }
}

class ProfilePage extends StatelessWidget {
  const ProfilePage({super.key});

  @override
  Widget build(BuildContext context) {
    return const Center(
      child: Text(
        'Profile Page\nNavigate to see the profile form',
        textAlign: TextAlign.center,
        style: TextStyle(fontSize: 18),
      ),
    );
  }
}

class TodoPage extends StatelessWidget {
  const TodoPage({super.key});

  @override
  Widget build(BuildContext context) {
    return const Center(
      child: Text(
        'Todo Page\nNavigate to see the todo list app',
        textAlign: TextAlign.center,
        style: TextStyle(fontSize: 18),
      ),
    );
  }
}

// Main entry point for running individual apps
void main() {
  runApp(const FlutterDemoApp());
} // Change to HelloWorldApp(), CounterApp(), etc. to run individual apps

// Flutter Widgets and Layouts Examples

import 'package:flutter/material.dart';

// 1. Basic Layout Widgets
class LayoutWidgetsDemo extends StatelessWidget {
  const LayoutWidgetsDemo({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Layout Widgets Demo',
      theme: ThemeData(
        primarySwatch: Colors.purple,
        useMaterial3: true,
      ),
      home: const LayoutWidgetsScreen(),
    );
  }
}

class LayoutWidgetsScreen extends StatelessWidget {
  const LayoutWidgetsScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Flutter Layout Widgets'),
        backgroundColor: Colors.purple,
        foregroundColor: Colors.white,
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const Text(
              'Layout Widgets',
              style: TextStyle(
                fontSize: 24,
                fontWeight: FontWeight.bold,
                color: Colors.purple,
              ),
            ),
            const SizedBox(height: 16),
            _ContainerExample(),
            const SizedBox(height: 24),
            _RowExample(),
            const SizedBox(height: 24),
            _ColumnExample(),
            const SizedBox(height: 24),
            _StackExample(),
            const SizedBox(height: 24),
            _ListViewExample(),
            const SizedBox(height: 24),
            _GridViewExample(),
            const SizedBox(height: 24),
            _WrapExample(),
            const SizedBox(height: 24),
            _ExpandedExample(),
          ],
        ),
      ),
    );
  }

  Widget _ContainerExample() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          'Container',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
          ),
        ),
        const SizedBox(height: 8),
        Row(
          children: [
            Container(
              padding: const EdgeInsets.all(16),
              margin: const EdgeInsets.only(right: 8),
              decoration: BoxDecoration(
                color: Colors.blue.withOpacity(0.1),
                border: Border.all(color: Colors.blue),
                borderRadius: BorderRadius.circular(8),
              ),
              child: const Text('Styled Container'),
            ),
            Container(
              width: 100,
              height: 100,
              decoration: BoxDecoration(
                gradient: LinearGradient(
                  colors: [Colors.purple, Colors.pink],
                  begin: Alignment.topLeft,
                  end: Alignment.bottomRight,
                ),
                borderRadius: BorderRadius.circular(12),
                boxShadow: [
                  BoxShadow(
                    color: Colors.purple.withOpacity(0.3),
                    spreadRadius: 2,
                    blurRadius: 8,
                    offset: const Offset(0, 4),
                  ),
                ],
              ),
              child: const Center(
                child: Text(
                  'Gradient',
                  style: TextStyle(
                    color: Colors.white,
                    fontWeight: FontWeight.bold,
                  ),
                ),
              ),
            ),
          ],
        ),
      ],
    );
  }

  Widget _RowExample() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          'Row',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
          ),
        ),
        const SizedBox(height: 8),
        Container(
          padding: const EdgeInsets.all(12),
          decoration: BoxDecoration(
            color: Colors.grey.withOpacity(0.1),
            borderRadius: BorderRadius.circular(8),
          ),
          child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              const Expanded(
                flex: 2,
                child: Text('Flexible Item 1'),
              ),
              Container(
                padding: const EdgeInsets.symmetric(horizontal: 16),
                decoration: BoxDecoration(
                  color: Colors.green,
                  borderRadius: BorderRadius.circular(4),
                ),
                child: const Text(
                  'Fixed',
                  style: TextStyle(color: Colors.white),
                ),
              ),
              const SizedBox(width: 16),
              const Expanded(
                flex: 1,
                child: Text('Item 2'),
              ),
            ],
          ),
        ),
      ],
    );
  }

  Widget _ColumnExample() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          'Column',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
          ),
        ),
        const SizedBox(height: 8),
        Container(
          width: double.infinity,
          padding: const EdgeInsets.all(12),
          decoration: BoxDecoration(
            color: Colors.orange.withOpacity(0.1),
            borderRadius: BorderRadius.circular(8),
          ),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Container(
                width: double.infinity,
                height: 40,
                decoration: BoxDecoration(
                  color: Colors.orange,
                  borderRadius: BorderRadius.circular(4),
                ),
                child: const Center(
                  child: Text(
                    'Header Item',
                    style: TextStyle(
                      color: Colors.white,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                ),
              ),
              const SizedBox(height: 8),
              const Expanded(
                child: Text('Flexible content that can expand or contract'),
              ),
              const SizedBox(height: 8),
              Container(
                padding: const EdgeInsets.all(8),
                decoration: BoxDecoration(
                  border: Border.all(color: Colors.orange),
                  borderRadius: BorderRadius.circular(4),
                ),
                child: const Text('Footer Item'),
              ),
            ],
          ),
        ),
      ],
    );
  }

  Widget _StackExample() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          'Stack',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
          ),
        ),
        const SizedBox(height: 8),
        SizedBox(
          height: 200,
          child: Container(
            decoration: BoxDecoration(
              color: Colors.red.withOpacity(0.1),
              borderRadius: BorderRadius.circular(8),
            ),
            child: Stack(
              children: [
                // Background layer
                Positioned.fill(
                  child: Container(
                    decoration: BoxDecoration(
                      gradient: LinearGradient(
                        colors: [Colors.red.withOpacity(0.2), Colors.pink.withOpacity(0.2)],
                        begin: Alignment.topLeft,
                        end: Alignment.bottomRight,
                      ),
                      borderRadius: BorderRadius.circular(8),
                    ),
                  ),
                ),
                // Middle layer
                Positioned(
                  top: 50,
                  left: 50,
                  child: Container(
                    width: 100,
                    height: 100,
                    decoration: BoxDecoration(
                      color: Colors.white,
                      borderRadius: BorderRadius.circular(50),
                      boxShadow: [
                        BoxShadow(
                          color: Colors.red.withOpacity(0.3),
                          spreadRadius: 4,
                          blurRadius: 8,
                        ),
                      ],
                    ),
                    child: const Center(
                      child: Icon(
                        Icons.favorite,
                        size: 40,
                        color: Colors.red,
                      ),
                    ),
                  ),
                ),
                // Top layer
                Positioned(
                  bottom: 20,
                  right: 20,
                  child: FloatingActionButton.small(
                    onPressed: () {},
                    backgroundColor: Colors.pink,
                    child: const Icon(Icons.add),
                  ),
                ),
              ],
            ),
          ),
        ),
      ],
    );
  }

  Widget _ListViewExample() {
    final items = List.generate(20, (index) => 'Item ${index + 1}');

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          'ListView',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
          ),
        ),
        const SizedBox(height: 8),
        SizedBox(
          height: 200,
          child: Container(
            decoration: BoxDecoration(
              color: Colors.teal.withOpacity(0.1),
              borderRadius: BorderRadius.circular(8),
            ),
            child: ListView.builder(
              padding: const EdgeInsets.all(8),
              itemCount: items.length,
              itemBuilder: (context, index) {
                return Card(
                  margin: const EdgeInsets.only(bottom: 8),
                  child: ListTile(
                    leading: CircleAvatar(
                      backgroundColor: Colors.teal,
                      child: Text(
                        '${index + 1}',
                        style: const TextStyle(
                          color: Colors.white,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                    ),
                    title: Text(items[index]),
                    subtitle: Text('Subtitle for ${items[index]}'),
                    trailing: const Icon(Icons.arrow_forward_ios),
                  ),
                );
              },
            ),
          ),
        ),
      ],
    );
  }

  Widget _GridViewExample() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          'GridView',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
          ),
        ),
        const SizedBox(height: 8),
        SizedBox(
          height: 200,
          child: Container(
            decoration: BoxDecoration(
              color: Colors.amber.withOpacity(0.1),
              borderRadius: BorderRadius.circular(8),
            ),
            child: GridView.builder(
              padding: const EdgeInsets.all(8),
              gridDelegate: const SliverGridDelegateWithFixedCrossAxisCount(
                crossAxisCount: 2,
                crossAxisSpacing: 8,
                mainAxisSpacing: 8,
                childAspectRatio: 1,
              ),
              itemCount: 6,
              itemBuilder: (context, index) {
                final colors = [Colors.amber, Colors.orange, Colors.deepOrange];
                final icons = [Icons.star, Icons.favorite, Icons.thumb_up];

                return Container(
                  decoration: BoxDecoration(
                    color: colors[index % colors.length],
                    borderRadius: BorderRadius.circular(8),
                  ),
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      Icon(
                        icons[index % icons.length],
                        size: 40,
                        color: Colors.white,
                      ),
                      const SizedBox(height: 8),
                      Text(
                        'Grid ${index + 1}',
                        style: const TextStyle(
                          color: Colors.white,
                          fontWeight: FontWeight.bold,
                        ),
                      ),
                    ],
                  ),
                );
              },
            ),
          ),
        ),
      ],
    );
  }

  Widget _WrapExample() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          'Wrap',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
          ),
        ),
        const SizedBox(height: 8),
        Container(
          padding: const EdgeInsets.all(12),
          decoration: BoxDecoration(
            color: Colors.blue.withOpacity(0.1),
            borderRadius: BorderRadius.circular(8),
          ),
          child: Wrap(
            spacing: 8,
            runSpacing: 8,
            children: [
              'Flutter',
              'Dart',
              'Mobile',
              'Cross-platform',
              'Widgets',
              'State Management',
              'Navigation',
              'Animation',
              'Testing',
              'Performance',
            ].map((tag) {
                final colors = [
                  Colors.blue,
                  Colors.purple,
                  Colors.pink,
                  Colors.indigo,
                  Colors.cyan,
                ];
                final color = colors[tag.length % colors.length];

                return Chip(
                  label: Text(tag),
                  backgroundColor: color.withOpacity(0.1),
                  labelStyle: TextStyle(
                    color: color,
                    fontWeight: FontWeight.w500,
                  ),
                  side: BorderSide(color: color.withOpacity(0.3)),
                );
              }).toList(),
          ),
        ),
      ],
    );
  }

  Widget _ExpandedExample() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          'Expanded & Flexible',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
          ),
        ),
        const SizedBox(height: 8),
        Container(
          height: 150,
          decoration: BoxDecoration(
            color: Colors.green.withOpacity(0.1),
            borderRadius: BorderRadius.circular(8),
          ),
          child: Row(
            children: [
              Expanded(
                flex: 1,
                child: Container(
                  margin: const EdgeInsets.all(8),
                  decoration: BoxDecoration(
                    color: Colors.green,
                    borderRadius: BorderRadius.circular(4),
                  ),
                  child: const Center(
                    child: Text(
                      'Expanded (flex: 1)',
                      style: TextStyle(
                        color: Colors.white,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                  ),
                ),
              ),
              Flexible(
                flex: 2,
                child: Container(
                  margin: const EdgeInsets.all(8),
                  decoration: BoxDecoration(
                    color: Colors.lightGreen,
                    borderRadius: BorderRadius.circular(4),
                  ),
                  child: const Center(
                    child: Text(
                      'Flexible (flex: 2)',
                      style: TextStyle(
                        color: Colors.white,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                  ),
                ),
              ),
              Expanded(
                flex: 1,
                child: Container(
                  margin: const EdgeInsets.all(8),
                  decoration: BoxDecoration(
                    color: Colors.green,
                    borderRadius: BorderRadius.circular(4),
                  ),
                  child: const Center(
                    child: Text(
                      'Expanded (flex: 1)',
                      style: TextStyle(
                        color: Colors.white,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                  ),
                ),
              ),
            ],
          ),
        ),
      ],
    );
  }
}

// 2. Responsive Design with LayoutBuilder
class ResponsiveDesignDemo extends StatelessWidget {
  const ResponsiveDesignDemo({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Responsive Design Demo',
      theme: ThemeData(
        primarySwatch: Colors.blue,
        useMaterial3: true,
      ),
      home: const ResponsiveDesignScreen(),
    );
  }
}

class ResponsiveDesignScreen extends StatelessWidget {
  const ResponsiveDesignScreen({super.key});

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('Responsive Design'),
        backgroundColor: Colors.blue,
        foregroundColor: Colors.white,
      ),
      body: SingleChildScrollView(
        padding: const EdgeInsets.all(16.0),
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const Text(
              'Responsive Layouts',
              style: TextStyle(
                fontSize: 24,
                fontWeight: FontWeight.bold,
                color: Colors.blue,
              ),
            ),
            const SizedBox(height: 16),
            _LayoutBuilderExample(),
            const SizedBox(height: 24),
            _MediaQueryExample(),
            const SizedBox(height: 24),
            _OrientationExample(),
            const SizedBox(height: 24),
            _AspectRatioExample(),
          ],
        ),
      ),
    );
  }

  Widget _LayoutBuilderExample() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          'LayoutBuilder',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
          ),
        ),
        const SizedBox(height: 8),
        LayoutBuilder(
          builder: (context, constraints) {
            if (constraints.maxWidth > 600) {
              return _WideLayout();
            } else {
              return _NarrowLayout();
            }
          },
        ),
      ],
    );
  }

  Widget _WideLayout() {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.blue.withOpacity(0.1),
        borderRadius: BorderRadius.circular(8),
        border: Border.all(color: Colors.blue),
      ),
      child: Row(
        children: [
          Expanded(
            flex: 1,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                const Icon(Icons.desktop_mac, size: 48, color: Colors.blue),
                const SizedBox(height: 8),
                const Text(
                  'Wide Layout',
                  style: TextStyle(
                    fontSize: 20,
                    fontWeight: FontWeight.bold,
                    color: Colors.blue,
                  ),
                ),
                const SizedBox(height: 8),
                const Text(
                  'This layout is shown on screens wider than 600px',
                  style: TextStyle(fontSize: 14),
                ),
              ],
            ),
          ),
          const SizedBox(width: 32),
          Expanded(
            flex: 2,
            child: Container(
              padding: const EdgeInsets.all(16),
              decoration: BoxDecoration(
                color: Colors.white,
                borderRadius: BorderRadius.circular(8),
                boxShadow: [
                  BoxShadow(
                    color: Colors.black.withOpacity(0.1),
                    blurRadius: 8,
                  ),
                ],
              ),
              child: const Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text(
                    'Content Area',
                    style: TextStyle(
                      fontSize: 16,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                  SizedBox(height: 8),
                  Text(
                    'This is the content area for wide screens. '
                    'We can use the extra space for more detailed content or side-by-side layouts.',
                    style: TextStyle(fontSize: 14),
                  ),
                ],
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _NarrowLayout() {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.blue.withOpacity(0.1),
        borderRadius: BorderRadius.circular(8),
        border: Border.all(color: Colors.blue),
      ),
      child: Column(
        children: [
          const Icon(Icons.smartphone, size: 48, color: Colors.blue),
          const SizedBox(height: 8),
          const Text(
            'Narrow Layout',
            style: TextStyle(
              fontSize: 20,
              fontWeight: FontWeight.bold,
              color: Colors.blue,
            ),
          ),
          const SizedBox(height: 8),
          const Text(
            'This layout is shown on screens narrower than 600px',
            style: TextStyle(fontSize: 14),
            textAlign: TextAlign.center,
          ),
          const SizedBox(height: 16),
          Container(
            padding: const EdgeInsets.all(12),
            decoration: BoxDecoration(
              color: Colors.white,
              borderRadius: BorderRadius.circular(8),
              boxShadow: [
                BoxShadow(
                  color: Colors.black.withOpacity(0.1),
                  blurRadius: 4,
                ),
              ],
            ),
            child: const Text(
              'Content is stacked vertically on narrow screens to optimize for mobile viewing.',
              style: TextStyle(fontSize: 14),
            ),
          ),
        ],
      ),
    );
  }

  Widget _MediaQueryExample() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          'MediaQuery',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
          ),
        ),
        const SizedBox(height: 8),
        Builder(
          builder: (context) {
            final screenWidth = MediaQuery.of(context).size.width;
            final screenHeight = MediaQuery.of(context).size.height;
            final isTablet = screenWidth > 600 && screenWidth < 1200;
            final isDesktop = screenWidth >= 1200;

            return Container(
              width: double.infinity,
              padding: const EdgeInsets.all(16),
              decoration: BoxDecoration(
                color: Colors.purple.withOpacity(0.1),
                borderRadius: BorderRadius.circular(8),
                border: Border.all(color: Colors.purple),
              ),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Icon(
                    isDesktop
                        ? Icons.desktop_windows
                        : isTablet
                            ? Icons.tablet_mac
                            : Icons.phone_android,
                    size: 48,
                    color: Colors.purple,
                  ),
                  const SizedBox(height: 8),
                  Text(
                    'Screen Size: ${screenWidth.toStringAsFixed(0)} x ${screenHeight.toStringAsFixed(0)}',
                    style: const TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
                  ),
                  const SizedBox(height: 8),
                  Text(
                    'Device Type: ${isDesktop ? 'Desktop' : isTablet ? 'Tablet' : 'Mobile'}',
                    style: const TextStyle(fontSize: 14),
                  ),
                ],
              ),
            );
          },
        ),
      ],
    );
  }

  Widget _OrientationExample() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          'Orientation',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
          ),
        ),
        const SizedBox(height: 8),
        OrientationBuilder(
          builder: (context, orientation) {
            final isPortrait = orientation == Orientation.portrait;

            return Container(
              width: double.infinity,
              padding: const EdgeInsets.all(16),
              decoration: BoxDecoration(
                color: Colors.orange.withOpacity(0.1),
                borderRadius: BorderRadius.circular(8),
                border: Border.all(color: Colors.orange),
              ),
              child: Column(
                children: [
                  Icon(
                    isPortrait ? Icons.phone_iphone : Icons.screen_rotation,
                    size: 48,
                    color: Colors.orange,
                  ),
                  const SizedBox(height: 8),
                  Text(
                    'Orientation: ${isPortrait ? 'Portrait' : 'Landscape'}',
                    style: const TextStyle(
                      fontSize: 16,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                  const SizedBox(height: 8),
                  Text(
                    isPortrait
                        ? 'Content is optimized for portrait viewing'
                        : 'Content is optimized for landscape viewing',
                    style: const TextStyle(fontSize: 14),
                    textAlign: TextAlign.center,
                  ),
                  if (!isPortrait)
                    Container(
                      margin: const EdgeInsets.only(top: 16),
                      child: const Row(
                        children: [
                          Expanded(
                            child: Placeholder(),
                          ),
                          SizedBox(width: 16),
                          Expanded(
                            child: Placeholder(),
                          ),
                        ],
                      ),
                    ),
                ],
              ),
            );
          },
        ),
      ],
    );
  }

  Widget _AspectRatioExample() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          'AspectRatio',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
          ),
        ),
        const SizedBox(height: 8),
        Container(
          padding: const EdgeInsets.all(16),
          decoration: BoxDecoration(
            color: Colors.teal.withOpacity(0.1),
            borderRadius: BorderRadius.circular(8),
            border: Border.all(color: Colors.teal),
          ),
          child: Column(
            children: [
              const Text(
                '16:9 Aspect Ratio',
                style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
              ),
              const SizedBox(height: 8),
              AspectRatio(
                aspectRatio: 16 / 9,
                child: Container(
                  decoration: BoxDecoration(
                    color: Colors.teal,
                    borderRadius: BorderRadius.circular(8),
                  ),
                  child: const Center(
                    child: Text(
                      'Video Content',
                      style: TextStyle(
                        color: Colors.white,
                        fontSize: 18,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                  ),
                ),
              ),
              const SizedBox(height: 16),
              const Text(
                '1:1 Aspect Ratio',
                style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
              ),
              const SizedBox(height: 8),
              AspectRatio(
                aspectRatio: 1 / 1,
                child: Container(
                  decoration: BoxDecoration(
                    color: Colors.lightGreen,
                    borderRadius: BorderRadius.circular(8),
                  ),
                  child: const Center(
                    child: Icon(
                      Icons.photo,
                      size: 48,
                      color: Colors.white,
                    ),
                  ),
                ),
              ),
            ],
          ),
        ),
      ],
    );
  }
}

// 3. Custom Widget Example
class CustomWidgetDemo extends StatefulWidget {
  const CustomWidgetDemo({super.key});

  @override
  State<CustomWidgetDemo> createState() => _CustomWidgetDemoState();
}

class _CustomWidgetDemoState extends State<CustomWidgetDemo> {
  int _rating = 3;

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Custom Widget Demo',
      theme: ThemeData(
        primarySwatch: Colors.red,
        useMaterial3: true,
      ),
      home: Scaffold(
        appBar: AppBar(
          title: const Text('Custom Widgets'),
          backgroundColor: Colors.red,
          foregroundColor: Colors.white,
        ),
        body: SingleChildScrollView(
          padding: const EdgeInsets.all(16.0),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              const Text(
                'Custom Widgets',
                style: TextStyle(
                  fontSize: 24,
                  fontWeight: FontWeight.bold,
                  color: Colors.red,
                ),
              ),
              const SizedBox(height: 16),
              const CustomCard(
                title: 'Custom Card Widget',
                description: 'This is a reusable custom card component',
                icon: Icons.star,
                color: Colors.red,
              ),
              const SizedBox(height: 16),
              Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  const Text(
                    'Interactive Rating Widget',
                    style: TextStyle(
                      fontSize: 18,
                      fontWeight: FontWeight.bold,
                    ),
                  ),
                  const SizedBox(height: 8),
                  RatingWidget(
                    rating: _rating,
                    onRatingChanged: (rating) {
                      setState(() {
                        _rating = rating;
                      });
                    },
                  ),
                  const SizedBox(height: 8),
                  Text(
                    'Current Rating: $_rating',
                    style: const TextStyle(fontSize: 16),
                  ),
                ],
              ),
              const SizedBox(height: 16),
              const ProgressIndicatorWidget(
                progress: 0.75,
                label: 'Project Completion',
              ),
              const SizedBox(height: 16),
              _buildAnimatedContainer(),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildAnimatedContainer() {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          'Animated Container',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
          ),
        ),
        const SizedBox(height: 8),
        const AnimatedContainerWidget(),
      ],
    );
  }
}

// Custom Card Widget
class CustomCard extends StatelessWidget {
  final String title;
  final String description;
  final IconData icon;
  final Color color;

  const CustomCard({
    super.key,
    required this.title,
    required this.description,
    required this.icon,
    required this.color,
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        gradient: LinearGradient(
          colors: [
            color.withOpacity(0.1),
            color.withOpacity(0.05),
          ],
          begin: Alignment.topLeft,
          end: Alignment.bottomRight,
        ),
        borderRadius: BorderRadius.circular(12),
        border: Border.all(color: color.withOpacity(0.3)),
        boxShadow: [
          BoxShadow(
            color: color.withOpacity(0.2),
            spreadRadius: 2,
            blurRadius: 8,
            offset: const Offset(0, 4),
          ),
        ],
      ),
      child: Row(
        children: [
          Container(
            padding: const EdgeInsets.all(12),
            decoration: BoxDecoration(
              color: color,
              borderRadius: BorderRadius.circular(8),
            ),
            child: Icon(icon, color: Colors.white, size: 24),
          ),
          const SizedBox(width: 16),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  title,
                  style: TextStyle(
                    fontSize: 18,
                    fontWeight: FontWeight.bold,
                    color: color,
                  ),
                ),
                const SizedBox(height: 4),
                Text(
                  description,
                  style: TextStyle(
                    fontSize: 14,
                    color: Colors.grey[600],
                  ),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }
}

// Rating Widget
class RatingWidget extends StatefulWidget {
  final int rating;
  final ValueChanged<int>? onRatingChanged;

  const RatingWidget({
    super.key,
    required this.rating,
    this.onRatingChanged,
  });

  @override
  State<RatingWidget> createState() => _RatingWidgetState();
}

class _RatingWidgetState extends State<RatingWidget> {
  late int _rating;

  @override
  void initState() {
    super.initState();
    _rating = widget.rating;
  }

  void _updateRating(int newRating) {
    setState(() {
      _rating = newRating;
    });
    widget.onRatingChanged?.call(newRating);
  }

  @override
  Widget build(BuildContext context) {
    return Row(
      mainAxisSize: MainAxisSize.min,
      children: List.generate(5, (index) {
        return IconButton(
          onPressed: () => _updateRating(index + 1),
          icon: Icon(
            index < _rating ? Icons.star : Icons.star_border,
            color: index < _rating ? Colors.amber : Colors.grey,
            size: 32,
          ),
        );
      }),
    );
  }
}

// Progress Indicator Widget
class ProgressIndicatorWidget extends StatelessWidget {
  final double progress;
  final String label;

  const ProgressIndicatorWidget({
    super.key,
    required this.progress,
    required this.label,
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: Colors.grey[100],
        borderRadius: BorderRadius.circular(8),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Row(
            mainAxisAlignment: MainAxisAlignment.spaceBetween,
            children: [
              Text(
                label,
                style: const TextStyle(
                  fontSize: 16,
                  fontWeight: FontWeight.bold,
                ),
              ),
              Text(
                '${(progress * 100).toInt()}%',
                style: const TextStyle(
                  fontSize: 14,
                  fontWeight: FontWeight.bold,
                ),
              ),
            ],
          ),
          const SizedBox(height: 8),
          Container(
            height: 8,
            decoration: BoxDecoration(
              color: Colors.grey[300],
              borderRadius: BorderRadius.circular(4),
            ),
            child: FractionallySizedBox(
              alignment: Alignment.centerLeft,
              widthFactor: progress,
              child: Container(
                decoration: BoxDecoration(
                  gradient: LinearGradient(
                    colors: [Colors.green, Colors.lightGreen],
                  ),
                  borderRadius: BorderRadius.circular(4),
                ),
              ),
            ),
          ),
        ],
      ),
    );
  }
}

// Animated Container Widget
class AnimatedContainerWidget extends StatefulWidget {
  const AnimatedContainerWidget({super.key});

  @override
  State<AnimatedContainerWidget> createState() => _AnimatedContainerWidgetState();
}

class _AnimatedContainerWidgetState extends State<AnimatedContainerWidget> {
  Color _color = Colors.blue;
  double _width = 100;
  double _height = 100;
  BorderRadius _borderRadius = BorderRadius.circular(8);

  void _animateProperties() {
    setState(() {
      _color = Colors.primaries[(DateTime.now().millisecond % Colors.primaries.length)];
      _width = 80 + (DateTime.now().millisecond % 120);
      _height = 80 + (DateTime.now().millisecond % 120);
      _borderRadius = BorderRadius.circular(8 + (DateTime.now().millisecond % 32));
    });
  }

  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        const Text(
          'Animated Container',
          style: TextStyle(
            fontSize: 18,
            fontWeight: FontWeight.bold,
          ),
        ),
        const SizedBox(height: 8),
        Center(
          child: AnimatedContainer(
            duration: const Duration(milliseconds: 300),
            curve: Curves.easeInOut,
            width: _width,
            height: _height,
            decoration: BoxDecoration(
              color: _color,
              borderRadius: _borderRadius,
              boxShadow: [
                BoxShadow(
                  color: _color.withOpacity(0.3),
                  spreadRadius: 4,
                  blurRadius: 12,
                  offset: const Offset(0, 6),
                ),
              ],
            ),
            child: const Center(
              child: Text(
                'Tap to Animate',
                style: TextStyle(
                  color: Colors.white,
                  fontWeight: FontWeight.bold,
                ),
              ),
            ),
          ),
        ),
        const SizedBox(height: 16),
        ElevatedButton(
          onPressed: _animateProperties,
          style: ElevatedButton.styleFrom(
            backgroundColor: Colors.red,
            foregroundColor: Colors.white,
          ),
          child: const Text('Animate Properties'),
        ),
      ],
    );
  }
}

// Main entry point
void main() {
  runApp(const LayoutWidgetsDemo());
}